2b299fed6a
While at it, made bb_process_escape_sequence faster (same size) function old new delta nextchar 49 53 +4 bb_process_escape_sequence 138 140 +2 next_token 838 839 +1 static.charmap 20 18 -2 is_assignment 143 135 -8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/2 up/down: 7/-10) Total: -3 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) Manuel Novoa III <mjn3@codepoet.org>
|
|
* and Vladimir Oleynik <dzo@simtreas.ru>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
#define WANT_HEX_ESCAPES 1
|
|
|
|
/* Usual "this only works for ascii compatible encodings" disclaimer. */
|
|
#undef _tolower
|
|
#define _tolower(X) ((X)|((char) 0x20))
|
|
|
|
char FAST_FUNC bb_process_escape_sequence(const char **ptr)
|
|
{
|
|
const char *q;
|
|
unsigned num_digits;
|
|
unsigned n;
|
|
unsigned base;
|
|
|
|
num_digits = n = 0;
|
|
base = 8;
|
|
q = *ptr;
|
|
|
|
if (WANT_HEX_ESCAPES && *q == 'x') {
|
|
++q;
|
|
base = 16;
|
|
++num_digits;
|
|
}
|
|
|
|
/* bash requires leading 0 in octal escapes:
|
|
* \02 works, \2 does not (prints \ and 2).
|
|
* We treat \2 as a valid octal escape sequence. */
|
|
do {
|
|
unsigned r;
|
|
#if !WANT_HEX_ESCAPES
|
|
unsigned d = (unsigned char)(*q) - '0';
|
|
#else
|
|
unsigned d = (unsigned char)_tolower(*q) - '0';
|
|
if (d >= 10)
|
|
d += ('0' - 'a' + 10);
|
|
#endif
|
|
if (d >= base) {
|
|
if (WANT_HEX_ESCAPES && base == 16) {
|
|
--num_digits;
|
|
if (num_digits == 0) {
|
|
/* \x<bad_char>: return '\',
|
|
* leave ptr pointing to x */
|
|
return '\\';
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
r = n * base + d;
|
|
if (r > UCHAR_MAX) {
|
|
break;
|
|
}
|
|
|
|
n = r;
|
|
++q;
|
|
} while (++num_digits < 3);
|
|
|
|
if (num_digits == 0) {
|
|
/* Not octal or hex escape sequence.
|
|
* Is it one-letter one? */
|
|
|
|
/* bash builtin "echo -e '\ec'" interprets \e as ESC,
|
|
* but coreutils "/bin/echo -e '\ec'" does not.
|
|
* Manpages tend to support coreutils way.
|
|
* Update: coreutils added support for \e on 28 Oct 2009. */
|
|
static const char charmap[] ALIGN1 = {
|
|
'a', 'b', 'e', 'f', 'n', 'r', 't', 'v', '\\',
|
|
'\a', '\b', 27, '\f', '\n', '\r', '\t', '\v', '\\',
|
|
};
|
|
const char *p = charmap;
|
|
do {
|
|
if (*p == *q) {
|
|
q++;
|
|
break;
|
|
}
|
|
} while (*++p != '\\');
|
|
/* p points to found escape char or '\',
|
|
* advance it and find what it translates to.
|
|
* Note that \NUL and unrecognized sequence \z return '\'
|
|
* and leave ptr pointing to NUL or z. */
|
|
n = p[sizeof(charmap) / 2];
|
|
}
|
|
|
|
*ptr = q;
|
|
|
|
return (char) n;
|
|
}
|
|
|
|
char* FAST_FUNC strcpy_and_process_escape_sequences(char *dst, const char *src)
|
|
{
|
|
while (1) {
|
|
char c, c1;
|
|
c = c1 = *src++;
|
|
if (c1 == '\\')
|
|
c1 = bb_process_escape_sequence(&src);
|
|
*dst = c1;
|
|
if (c == '\0')
|
|
return dst;
|
|
dst++;
|
|
}
|
|
}
|